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Kassel is a small city (자리잡은, 위치한 ) in central Germany. 

located

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This all began with a prominent German artist 

(~라는 이름의) Joseph Beuys, (그런데 그는) came up with 

the idea to plant 7,000 oak tress throughout the city. 

named

who

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Despite numerous challenges, he remained (확고한 )

in his determination ('~를 시키려는' 뜻의 두 단어) 7,000 trees planted. 

firm

to have 

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During the  ( 끔찍한, 두려운 )  World War 2, Kassel was the  (심장, 중심)    of German military production. 

dreadful 

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